7 Best Cinder Block Sealer : Expert Recommendation 2024

Cinder Block Sealer

Cinder blocks are a strong and versatile building material. They can be used as retaining walls or for other purposes. They’re easy to shape, but they’re also porous, which means moisture and water can seep inside your walls leading to damp, moldy walls or even worse-rising through the roof of your house!

تساقط الشعر الذكور هو في الواقع شيء أن الكثير من الرجال قلقا خاصا حول وأتمنى أن يحدث ذلك أبدا. ومع ذلك ، هناك العديد من خيارات العلاج التي يمكن أن تساعد في إبطاء العملية. يرجى التشاور مع أخصائي ل تناول صحيح من propecia ، بحيث لا تضر صحتك

One of the best ways to improve block construction is by sealing them. Sealing improves their appearance and also keeps them from absorbing water, which can weaken them. In this article, we will be reviewing the best cinder block sealer so that you can learn how to go about choosing one so that your investment lasts as long as possible.

KILZ Interior/Exterior Basement Waterproofing Paint

Rain Guard-CR-0356 Water Repellent Sealer

Red Devil 0912 Polyurethane Sealant

Top 7 Cinder Block Sealer

You don’t need a degree in architecture to know that cinder block walls are not only durable, but also have the potential to be beautiful.

However, if you want your blocks to last for decades without any major repairs or replacements, it is important that you take the time and research necessary when choosing sealer for your wall.

The products listed below have been hand-selected by us, and should guide you in the right direction when browsing for sealants.

1. Red Devil 0912 Polyurethane Sealant

Red Devil Polyurethane Foam and Filler of Large Gap Spray is sure to be the most durable solution you can choose for your next project. The polyurethane foam is water-resistant and easy to use, so you can fill even the most difficult projects.

This Red Devil foam expands up to 3 times its original size. The foam is resistant to water and humidity, making it a good solution for filling cracks in your concrete foundation or block wall.

This professional grade filler product fills cracks in concrete slab or cinder wall construction sites using an easy to apply texture for detailing. It’s also possible to use it between ductwork flanges just as easily as installing on the interior walls where you need it most. 

The Red Devil Foam & Fill Large Gaps are not only reusable but they are also easily installed. It Permanently fills gaps, penetrations and voids around windows, doors, pipes, outlets and electrical wires with this polyurethane foam material.

This quick-set spray sealant foam expands to fill your walls efficiently from a canister and cures within minutes. Foam & Fill Large Gap Foam is made of closed cell insulation that resists water intrusion much better than open cell versions.

It’s possible to properly finish any project, from refilling cracks between the pieces of cinder to completing insulation in your attic, by using Red Devil Foam & Fill Large Gap Filler Spray.

Highlighted Features:

  • Simple to handle and fast.
  • Seals, bonds, insulates, plugs gaps in roofs, plywood, block or cinder block walls, and in areas near pipes, wiring, drainage pipes, and air conditioning lines.
  • You can grind, paint or color dried foam.
  • There is no HCFC or CFC in this substance, so it is environmentally friendly.
  • Suitable for interior and exterior applications.

2. KILZ Interior/Exterior Basement Waterproofing Paint

Kilz has been producing high-quality products and paints for around 40 years – they were awarded “Best Paint Brand” at the year 2015 by Harris Poll EquiTrend. It is a premium coating from KI LZ that is designed to waterproof porous concrete surfaces and masonry outside and inside your home. 

KI LZ has a low odor water-resistant formula that assures long-lasting durability after application both inside and outside your home. The product uses nanotechnology for a membrane that blocks any unwanted water infiltration, as well as an alkali-resistant coating, which prevents any moisture from penetrating through the basement walls or exterior masonry. 

With a good degree of durability, it will last for quite some time. An elegant finish is provided by the alkali resistant exterior coating designed for interior interior surfaces designed to wipe down dusty remnants, while below-grade applications require hydraulic cement before the first layer is applied.

You should use a minimum of two layers when using this product on a square footage basis, depending on the surface or porosity of the walls. You have to use the KILZ Premium Primer on all areas of uncoated wood or metal before you apply it so it works best for you.

It is a multi-purpose sealant that cures within one hour and then you can re-coat it within six hours! Within an hour, the material dries to touch and can be re-coated within four hours, depending on the humidity. In order to enhance its protection against even water infiltration up to 60 weeks at least, you would need to apply this product to well-prepared concrete.

This paint comes at a price, but it is well worth it for its performance and durability. If you are searching for a product that won’t loosen and crack, this is the perfect choice. It’s a great option for protecting your cinder blocks if you need to waterproof them in some way. Despite the fact that this coating is expensive, it is likely to last longer than any other coatings.

Highlighted Features:

  • Prevents water infiltration for up to 60 weeks.
  • Low odor water-resistant formula.
  • Provides Alkali-resistant coating.
  • Cures quickly in one hour, Re-coat within 4 hours of initial coat application..
  • Comes at a price but it is well worth it for the quality.

3. Rain Guard-CR-0356 Siloxane Professional Grade 

The Rain Guard-CR-0356 is a water-based sealer that restores, protects, and extends the life of any surface which works on cinder block walls as well as concrete block walls with a high-performance hydrophobic coating. 

This coating is being used more and more in contaminated surfaces, as the clear spray sealant does not contain sheen along with being non-yellowing at the same time. 

It is well suited as a stain repellent, as well as antifreeze and for protection against oil, gas, and other liquids. Featuring excellent resistance against water, salt damage, ice removal agents, and wind-driven rain, this product provides excellent performance.

Among the many advantages of Rain Guard CR 0356 liquid rubber include its easy clean up after application by just using soap and warm water.  This is far superior to other alternatives, such as wax or varnish, which needs to be scraped off when they discolor.

Among many other damaging elements, Micro-seal’s proprietary Micro-Lok ingredient effectively bonds the materials together and also creates hydrophobic barriers that are impervious to moisture, contaminants, and extreme conditions, ultra violet lights and windborne rainfall, in addition to numerous other factors.

This type of sealant also protects vertical as well as horizontal surfaces so regardless if you have concrete lining your pool walls or plumbing fixtures need protecting from salt corrosion, Rain Guard – CR-0356 will do the job effectively without leaving any residue behind on one’s clothes or skin.

The Rain Guard-CR-0356 can be applied in sanitary food processing facilities, nuclear power plants, chemical spills, and oil refineries, a clean surface below the water line for any boats or barges that are transporting cargo to and from these locations.

Highlighted Features:

  • Water-based concrete coating that restores, protects and extends the life of any surface.
  • Has no sheen while being non-yellowing.
  • Can be used to protect from stains such as oil, gas, and antifreeze.
  • It is Inexpensive to apply.
  • Newer and most innovative use for hydrophobic coating is in contaminated surfaces.
  • Clear spray sealant contains no sheen while being non-yellowing as well.

4. INSL-X AMW100009A-01 WaterBlock Acrylic

With over 30 years experience in the manufacture of high quality waterproof coats for homes and buildings, INSL-X is the leading manufacturer in the industry. As a company, they are committed to developing products that allow you to have greater satisfaction with your work or leisure activities.

INSL-X AMW100009A-01 Masonry Waterproofer Coat & Sealant 10% White provides a superior, fast-drying, one-coat dye for interior and exterior brickwork, block exteriors, concrete walls, stucco surfaces, and cement patios. It has increased alkali resistance up to pH 13 which makes it an ideal option for those based with polluted soils and waterproofing on bare masonry, block, plaster or tilted building walls.

The white formulation boosts aesthetic appeal on light colored masonry surfaces while guarding them against water penetration. This basement and masonry water resistant coating does not require preparation or moistening. As a result of its excellent waterproofing properties as well as the presence of an agent that inhibits the growth of mildew, this product is ideal for basement waterproofing. 

In addition to the fact that it is eco-friendly and compliant with the VOC laws, you can use it indoors or outdoors in your homes, schools or businesses with confidence. INSL-X Masonry Waterproofer should be used for vertical wall coatings like indoor and out-of-door waterproofing and is not recommended for use on ground.

Use INSL-X AMW100009A-01 to make it immune to water damage and protect your masonry projects and enjoy the peace of mind that comes from knowing you’ve chosen a proven solution you can trust. The material should be applied directly to bare masonry surfaces. In order to obtain the best results, the product should be used with non-damp surfaces while it can be applied on damp surfaces as well. 

With this waterproofing paint for basements and masonry, surface prewetting is essential to ensure that the coating will adhere to the surface.

Highlighted Features:

  • It has increased alkali resistance up to pH 13, making it an ideal solution for those based on polluted soils.
  • The product is VOC compliant making it a good option for indoor and outdoor masonry waterproofing.
  • This eco-friendly sealer inhibits the growth of mildew on the surface of the acrylic film.
  • This sealer is easy to apply. No pre-mixing or surface pre-wetting is necessary with this basement and masonry waterproofing paint product.

5. Essential Values Concrete Sealer Acrylic Emulsion Formula

The Essential Values Concrete and Stone Sealer Finish is ideal for protecting and finishing concrete surfaces such as walkways, parking lots, decks, garages, and more.

The sealer includes the features of a high quality but affordable product such as being made in America which ensures that the main ingredients are also domestically sourced to ensure their safety. 

They take customer feedback into consideration with every step of design so we always get what you want from us: Quality Products at Affordable Prices! The Essential Values team strives to provide products that cater to all budgets.

For this reason it seals both indoors or outdoors whether stone or tile. It’s able to withstand any environment or extreme weather conditions without losing its effectiveness. It has the capability to choose whether you want a glossy look or smooth appearance. You can choose whether you want the concrete sealer to give the effect of a wet look.

The sealer has a standard one-day cure time which allows it to properly harden onto the surface of the car so that it will act as a protective coating for a long time. Suitable for both outdoor and indoor use, the Concrete and Stone Sealer Finish is ideal for both.

Highlighted Features:

  • Incorporates ingredients domestically sourced to ensure their safety.
  • Uses customer feedback in every step of design.
  • Available in wet look gloss finish or smooth clear appearance.
  • Standard one day cure time to harden into a protective coating on the surface.

6. Lithi-Tek 9500 Ultra Concentrate Sealer

Lithi-Tek 9500 Concrete Sealer is A high-performing, deep penetrating sealant designed for concrete & masonry surfaces. It is the easiest way to protect and solidify your concrete foundation from water/moisture damage! The smallest molecular structure of the nanomolecules is able to penetrate deep into the substrate despite the fact that its size is smaller than conventional molecules.

Its reactive agent will form an insoluble crystalline structure within the pores and capillaries increasing density while it’s hydrophobic surface helps repel any water sources soothe away external erosions. One of the more difficult aspects of concrete sealers is how they go on. They are dirty, disorderly and hard to apply, often leaving a residue that makes them unattractive and can be a slip risk.

Lithi-Tek 9500 is a low odor concrete sealant that works great on most types of surfaces, including driveways, porches, sidewalks. This paint is free from volatile organic compounds and harmful chemicals so you can rest assured that it will not harm your relatives or household pets when they come into touch.

This product provides a protective layer against oil leaks and stains on clothes and furniture, while shielding them from moisture. It also shields from saline loss throughout the wintertime and from UV radiations for up to five years!

Speaking of past products, we should mention that it is safe to use and unlike the others, you may have tried in the past, this product will not have leftover toxic chemicals. The liquid is non-staining, meaning you don’t have to worry about stains on clothes.

You can expect a long-lasting invisibility finish after application with light gray color restoring back to normal appearance of natural concrete one week after completion leaving you with peace of mind knowing everything is under protection. Once applied, Lithi-Tek 9500 comes into contact with water which will turn it back to its solution form through the process of Nano precipitation reactive.

Reaction with water stabilizes the agent allowing for it to penetrate deep within the substrate forming an insoluble crystal. Lithi-tek 9500 dries completely invisible, leaving the base’s appearance completely natural and forms an effective barrier within concrete resisting erosion as well as water seepage.

This product is non-toxic, non-hazardous and environmentally friendly making it absolutely safe for installations with no special precautions needed during or after application. Embedment properties of Lithi-tek 9500 allow it to resist the effects of weather, allowing concrete bases to last up to 30 years longer than before.

Highlighted Features:

  • Deep penetrating sealant for concrete/masonry surfaces that solidifies concrete, water damage, and erosion.
  • The hydrophobic surface which seals off any water sources, as well as making it impervious to water damage.
  • It is non-toxic and non-hazardous, environmentally friendly, and safe during installation with no special precautions needed.
  • It is a high-performing product that will provide a long-lasting invisibility finish to natural concrete color restoration in one week.
  • Reactive agent forms an insoluble crystalline structure within the pores and capillaries increasing density while its hydrophobic surface helps seal off any water sources throughout the concrete substrate.

7. Foundation Armor SX5000 WB DOT Sealer

Are you looking for a way to increase the life of your cinder block based interior or exterior walls? For this purpose, several states have approved the Armor SX5000 WB by the Department of Transportation. This product’s name “W” refers to the fact that it can only be activated with water, providing an easy-to-apply, quick-drying alternative to more expensive water/solvent products.

With one coat, Armor SX5000 WB is an excellent penetrating concrete sealer that protects your concrete from the harmful effects of the elements. It can be used for sealing concrete, paver bricks or stucco onto natural stones (just about anywhere).

Best of all, you can use it in all sorts of construction areas like brick patios, pools decks and garages. Essentially, this is a penetrating compound that penetrates and forms a hydrophobic barrier within the pores of the concrete. 

As it offers long-term protection against freeze-thaw cycles, this sealant is also useful in filling voids between concrete aggregates or filling joints in masonry walls. Recommended for residential or commercial projects with no visible cracks or structural damage, you can use Armor 2500 indoors only if applied by certified applicators, such as major home center stores.

SX5000 is a proven sealer that has been used for decades by contractors across America. This product contains 5X more active material than similar products currently available on the market, providing maximum water protection for porous surfaces like concrete floors, sidewalks or driveways

Although it is an environmentally friendly coating, it also protects from salt water corrosion and ozone pollution. This water-repellent barrier can last for up to 7-10 years, offering a way to reduce damage and deterioration caused by water seepage, such as cracking, spalling or pitting. 

In addition, the hydrophobic material dries faster and looks cleaner for years. With just 1 coat on a 25×120 foot deck or patio slab, all of your water absorption problems are gone! Make sure to apply two coats 24 hours apart for best performance.

Not only will it reduce water penetration and damage but will also last up to 10 years before a reapplication is needed, longer than any other product on the market.

Use a roller when applying Armor SX5000 WB to provide a consistent coating for best results Directly spraying the product from a hose sprayer will remove air voids and cause overspray to occur which can result in missed areas of coverage.

Highlighted Features:

  • Approved by the DOT in several states for this purpose.
  • Protects you from expensive and damaged elements with one coat.
  • Can be used for attaching concrete, paver bricks, or stucco onto natural stones (just about anywhere).
  • Has long-term protection against freeze-thaw cycles and water absorption for the interspersed voids of concrete aggregate particles or between masonry units.
  • Recommended for residential or commercial projects with no visible cracks or structural damage.

Factors to Consider

Factors to Consider

There are a lot of factors that you should take into account when you’re buying sealants for cinder block. The list is given below.

Type of Sealant

Type of Sealant

Before you buy a sealant, you should decide if you want a water-based or oil-based one.

Oil based will be more resistant to chemicals, but it will also release chemical fumes into the air during application. They offer long-lasting protection but they will always repel water and not absorb it.

Water based sealers work best on new bricks, while oil based sealer works best on old walls that are in bad condition. They are also affected by load buildup from water.

Water based sealers will be best to use in areas that never get wet like basements, but if they’re going to be exposed to moisture then oil based ones should instead of a water-based one.


Look for a product that comes with decorative and protective qualities. These will help to give your home an old world charm and they offer other benefits as well. The right product will fit the needs of your relative humidity-free basement.

Products designed for basements work best in areas with a moisture level between 40 to 80 percent, though a quality sealant should be able to withstand a much drier environment. So when looking for an exterior product, be sure to investigate what type of quality it offers.

While they are not waterproof, they can prevent some level of water damage on your walls. They will act as a deterrent for pests, mildew and they protect the cement joints from water damage and freezing.

Ease of Instruction & Use

Ease of Instruction & Use

Sealants for cinder blocks should have easy application instructions to follow when applying them to your concrete. If it’s too complicated or difficult then you might want to look at another product instead.

Also, choose a product that is easy to use since you don’t want to be spending too much time doing this when you could be spending that time doing something else more interesting instead.

Shelf Life

Another important thing to look at when buying cinder block sealant is the shelf life. Some have a very short shelf life of a few months and others can last for a year or more if stored correctly. 

The more shelf life it has the better, but you also want a product that won’t expire anytime soon.


Price is always important when purchasing a Sealant because not everyone can afford an expensive price tag, but also look for a product that offers great quality so it’s well worth the price.

The prices of adhesives vary greatly depending on the size of your order and brand name. You will find that you can get sealers to last months for less than a hundred dollars or more than two hundred dollars for a year’s supply.

Look for a Sealant with an inexpensive price but great quality. You want to find a product that you won’t have to replace frequently and one that will last the entire season which means it should be affordable.

Look for Additives

Look for Additives

The sealant may come bundled with additives that can repair cracks, seal the mortar joints and add an extra layer of protection to your home’s surface. It’s important to look for additives that will benefit your home and give you the best results.

Drying Time

You also want a product that will dry quickly, you don’t want a product that requires days or hours in order to dry because you might end up with hard troweled concrete, which is something you try to avoid.

You don’t want to have a product that takes hours or even days to dry, you want one that dries fast without compromising its quality. Look for a sealer that dries fast.

Color Selection

Color Selection

Even though you are buying Sealant,  you may want to get one that has a color you can choose from. This will help to match the new sealer with the existing surface of your home. 

You want to pick a color that matches well with your brick, if you don’t then it will stand out like a sore thumb and be glaringly obvious.

Waterproofing Properties

Waterproofing Properties

A lot of times sealers are applied to prevent your home’s exterior from warping but what you may not know is that they also help with other issues like mildew, water damage and even pest control. 

They will keep your pavers looking new for the longest time and make them look great while doing it. Check for the amount of waterproofing qualities a product has.



Some of the advantages that can be enjoyed are as follows:

Easy to Use

Easy to Use

Because it is so easy to use, there is no need for licensed contractors. This home improvement project is applicable to anybody with a few basic home improvement skills.

The powder form of this coating is very easy to apply and it does not require a lot of preparation when compared to other products that are available on the market. 

This means that it can be applied by anyone regardless of their skill level as long as they know what they are doing.

The cinder block sealer can be applied professionally if you want it to look great but are not skilled at home improvement. 

This is because it has a smooth, even finish when it is applied and can be painted over once the job is finished. It also has a glossy and durable finish after drying.

More Breathable Than Traditional Latex Paints and Stains

More Breathable Than Traditional Latex Paints and Stains

The sealant for cinder blocks is a breathable product that is a great substitute for latex paints and stains. It also requires very little preparation before application as it does not need to be primed or prepped. 

This product can help with any number of tasks including but not limited to adhesion, waterproofing, and filling.

Block Cracks on the Inside or Outside

This product is capable of sealing cracks within the wall by applying it from the inside. It can also seal cracks from the outside by applying it to an existing coating. 

In addition, this product provides a waterproof barrier to the surfaces that it is applied to. This allows an individual to utilize them for many different things.

Environmentally Safe & Non-toxic

Environmentally Safe & Non-toxic

This type of sealant is environmentally safe, non-toxic, and is not harmful to any plants or animals. It does not contain dangerous chemicals compared to other products such as latex coatings. 

It is also not easily broken down by the environment and will continue to do what it needs to do for many years.

In contrast, the adhesive agent is a substance that contains no volatile organic compounds.This is good because it means that the unit will not emit any toxic fumes or gases into the environment.

Suitable for All Types of Buildings

Suitable for All Types of Buildings

This solution can be used anywhere. This is because it will seal the cracks and crevices in the surface and keep water from penetrating into them. It can also provide a waterproof barrier to the wall so that moisture cannot get inside of them.

The sealant product is suitable for all types of buildings. Whether one is in a rural, urban, or suburban location, this product will be able to seal up cracks in the concrete that are needed to keep moisture and bugs out. 

It does not need priming or preparation before application making it easy to use for those who are unfamiliar with building techniques.


This coating is not expensive when it’s compared to other products that are available on the market. They are the most popular and affordable option which are available in both liquid and powder form.

Fuel & Heat Resistant

Fuel & Heat Resistant

This adhesive compound is resistant to fuels and will not degrade or break down when it comes in contact with these substances. This is good because it means that one’s fuel tank will not be at risk of rusting and the wall will not deteriorate due to the fuel.

Better heat resistance than other products such as paints and varnishes which means that it will not degrade or break down when exposed to high temperatures and will not allow moisture to get in under the panels. When used in conjunction with fiberglass insulation, this product can prevent condensation from occurring.


Why do Cinder Block Walls leak?

A cinder block is much more porous than a normal concrete slab or poured concrete. Cinder is categorised as permeabilized to water vapor (+10 perms). 

Heavyweight concrete blocks are semipermeability (5 perms and less so in hollow cores filled with a slurry mix of Concrete about 2 perm) and are of good quality. 

A thin wall only separates one-quarter inch-thick hollow bricks from cores that fill water. It is clear that water can pass through mortar joints and through holes making them damp.

How do I seal Cinder Block Walls?

As they can inhibit the sealer from working it must be removed and cleaned as well. Ouvre all the windows and doorways because your breeze will go – your home won’t turn into an oven under this hot climate. 

Apply the sealer on any interior corners and outer perimeters with a paintbrush. Apply the sealant to a paint roller along the full length and width of a side twice. If you want to do your job a bit faster, cover the wall with spray. 

Fill with sealants the reservoir of your machine and pump up and down till pressure is built into the vessel.

Does Cinder Block Sealant work outside?

Yes, you can use a cinder block coating on the outside of your home.

Should the Sealer be Visible on the Outside?

The cinder block sealant should be visible, so under trim is not a good place to apply it.

How does Cinder Block Sealant Differ From Other Types of Sealants?

Some of the main advantages of using a sealing agent are that it creates a water-tight seal, it’s usually much cheaper than other sealants, and it can be applied to either the inside or outside of your home.

How do I Apply the Sealant Correctly to Get Optimal Results?

How do I Apply the Sealant Correctly to Get Optimal Results

To apply the sealant correctly, you’ll need to do the following:

– Prep the surface with a wire brush or sandpaper so there are no loose particles.

– Clean any excess dust and debris off of the surface with a rag.

– Apply the sealant liberally in two inches thick full width strips all the way across the top of the panel.

– Allow one hour to dry before adding more layers or proceeding with any type of landscaping.


Cinder blocks are adaptable and enduring, but they require the right sealer to prevent water from seeping through the joints. Sealing cracks in the material can be done with a few different products on the market.

It is designed specifically for cinder block structures of all shapes and sizes as well as concrete walls in residential or commercial buildings. Plus it’s easy to apply so you won’t spend hours slaving away on your project!

It has many advantages over other products such as being environmentally safe to use around water sources, easy to apply by hand without needing any special tools or skills, and affordable when compared to competitive options on the market for this type of product.

It is a product that can be used for many purposes and will not produce any harmful fumes or chemicals when applied to the surfaces. It comes in different forms making it an excellent choice no matter what your needs are. It will also not cost a lot of money but perform very well which makes it worth every penny.

I hope you have found this article helpful in choosing the best cinder block sealer and what it can do for you. Make sure to get some today!

7 Best Cinder Block Sealer : Expert Recommendation 2024

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